UV/EB Equipment for Printing & Packaging Applications · UV/EB Equipment for Printing & Packaging...
Transcript of UV/EB Equipment for Printing & Packaging Applications · UV/EB Equipment for Printing & Packaging...
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UV/EB Equipment for Printing & Packaging Applications
Stephen C. Lapin, Ph.D.Applications Specialist
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Which is better for printing and packaging; UV or EB?
Yes
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Solvent Based Inks, Coatings, and Adhesives
Solvents function as a “carrier” for the “solids” portion of the ink, coating, or adhesive
Solvent is a high value material with a low value “temporary”functionSolvent costs are increasing with costs of oil and natural gasMost common way to handle solvent emissions is thermal oxidation which produces greenhouse gas (CO2)
Solvent based materials are old technology out of step with a sustainable future
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Water Based Inks Coatings and Adhesives
Water – plentiful, low cost, environmentally friendly “carrier”Disadvantages of water:
High energy needed to remove waterHeat of vaporization (calories/gram)
water = 540, toluene = 88, heptane = 76Dryer energy to remove water results in more CO2emissionsWater based coatings typically have some VOC content (co-solvent or coalescing-solvent)Film properties
2-componet systems needed for “resistance” propertiesLower glossLower print quality due to “dot gain”
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Ink Drying Energy EstimatesAssume 60” wide, 6 color press, running 1000 ft/min
Solvent/Water (conventional thermal drying)Natural gas fired dryersEstimate 30M Btu/h (880 kW) for drierNeed to gather actual operating press dataOxidizer energy cost dependant on solvent load
UV PressInput power = 8 lamps x 600 w/in x 60 in = 288 kW92% efficient power supply + 30 kW cooling = 343 kW total
EB PressEB power supply plus cooling = 85 kWLiquid nitrogen to supply 80 scfm inerting uses equivalent of about 100 kWTotal = 185 kW
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UV/EB Technology Selection
UV and EB have some similarities and fundamental differencesSelection of UV or EB should be based on the best fit for the process and applicationBest fit considerations may include:
Enabling of end-useCapital costOperating costsEnd-use propertiesFitness for food packagingSubstrate considerations
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Energy
UVEnergy in the form of photonsWavelength determines energy; typically 250 to 450 nmEnergy unit conversion; 350 nm photon = 3.5 eVTotal applied energy typically 0.1 to 0.5 J/cm2
EBEnergy in the form of accelerated electronsAccelerating voltage determines energy; typically 80 to 180 kVTypical electron energy at substrate; 70,000 eVTotal applied energy typically 20 to 40 kGy
1 kGy = 1 J/gramFor 50 gram/meter2 layer = 0.1 to 0.2 J/cm2
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Energy
UVEnergy not sufficient to directly initiate polymerization (non-ionizing)Photoinitiator must be used
EBWill ionize any organic materialNo photoinitiator needed
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Penetration
UVPenetration depends on the optical density of the materialPenetration is controlled by the peak irradiance (power and focus) of the UV sourceGood penetration into clear materialsLimited penetration into pigmented, filled, and opaque materials
Effective curing of thin ink filmsEffective curing of thick coatings with low pigment loadingLamination of clear materials
EBPenetration depends on the mass density of the materialPenetration is controlled by acceleration potential (voltage) of the beamEasily penetrates into clear, pigmented, filled, and opaque materials
Can cure thick and/or heavily pigmented or filled inks and coatingsEnables lamination of opaque materials
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Penetration/Energy Deposition
UV Photons EB Electrons
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UV Equipment
Medium pressure mercury electric arc powered lampsMedium pressure mercury microwave powered lampsPulsed xenon lampsSolid state LED arrays
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Mercury Arc Lamp Components
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Microwave Powered Mercury Lamp Components
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Pulsed Xenon Lamp System
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UV LED Array
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UV EquipmentUV Source Strengths Weaknesses
Medium pressure mercury arc powered lamps
High throughputWide widths available (>60”)Broad spectral outputPrinting and converting
High heat outputLong warm-up time (shutters)Non-uniform aging
Medium pressure mercury microwave powered lamps
High throughputLong lamp lifeFast warm-up (no shutters)Industrial and 3D
Each lamp 10” max widthHigh heat output
Pulsed xenon lamps
Very low heatHigh pulse irradianceBroad spectral outputIndex (stop and go) processes
Low continuous output
LED arrays Very long lifeInstant onCompact – system integrationInk jet
Narrow spectral outputLow throughputLow peak irradiance
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EB Equipment
High energy scanning type(300 – 10,000 kV)Industrial self-shielded multi-filament type
(150 – 300 kV)Low energy self-shielded multi-filament type(70 – 150 kV)Low energy compact modular type
(70 – 150 kV)
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Electron Beam Equipment
Industrial Electron Beam Processor
New GenerationLow EnergyElectron Beam Processor
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Compact Modular EB Emitters
16.0 in
11.5 in
34.0 in
18.0 in
9.9 in
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EB EquipmentEB Source Strengths Weaknesses
High energy scanning(300 – 10,000 kV)
Cure through very thick materials
Curing of compositesCrosslinking of 3D materials
High capital costVery large sizeExtensive shielding
required
Industrial self-shielded multi-filament (150 – 300 kV)
Very high throughputWide widths (>100”)Penetration of thick filmsFilm Crosslinking
High capital costLarge sizePotential substrate
damage
Low energy self-shielded mult-filament (70 – 150 kV)
Very high throughputWide widths (>60”)Controlled penetrationPrinting and packaging
Not well suited for 3D applications
Low energy compact modular (70 – 150 kV)
Lower costPermanent vacuumCompact modular designSurface sterilization
Width maximum 16” per emitter
Lower throughput
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Equipment Size
UVRelatively smallFull interstation installation (lamp after each print deck) is commonInterstation lamps allow dry trapping of multiple ink colorsMultiple lamps may be used after last deck for final curing
EBOriginal industrial equipment is quite largeNewer low voltage equipment is much smaller; however, interstation installation still not practicalPrint technologies allow curing with a single EB unit at the end of the press
Web offset (lithographic) printingSun WetFlexTM (flexographic) printing
Low voltage permanent vacuum type could potentially allow interstation installation
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Equipment Safety
UVUV light can cause skin and eye damage upon exposureHigh temperature lamp could result in skin burns upon contactUV lamp units are completely self shielded
EBLimited penetration of electronsSecondary x-rays are primary hazardNot radioactive. No radiation can be present unless high voltage is onEB units are completely self-shieldedInterlocked to cut power if shielding is removedContinuous monitoring will shut-down unit if x-rays are present
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Capital Cost
UVRelatively low cost for few number of relatively narrow lampsHigh-speed (>1000 ft/min) will typically require 4 to 6 lamps in seriesWide web (>50 inch) multi-lamp systems begin to approach EB costs
EBOriginal higher voltage (>150 kV) units cost greater than $ 1 MMNewer lower voltage equipment has reduced cost 50% or moreSingle EB unit will cure >50 inch-wide web at >1000 ft/min
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Operating Costs
UVAbout half of the energy input to the lamp is converted to UV lightRemaining energy is lost as heatAdditional energy required for lamp cooling (air blowers most common)
EBMore efficient conversion of electrical power to curing energyAdditional energy requirements for vacuum pumps, water coolingAdditional cost of Nitrogen
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InertingUV
Free-radical curing inhibited by atmospheric oxygenCuring in air can be accomplished for many systems due to high surface irradianceAir curing important for sheet-fed printing applicationsInerting can greatly accelerate cure and/or reduce photoinitiator requirementsInerting may be an attractive option for food packaging
EBFree-radical curing inhibited by atmospheric oxygenInks and coating require an inert atmosphere to cureEffective inerting limited to web applicationsLaminations can be cured without inerting since laminate layer excludes oxygen
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Effect on Substrates
UVNon-ionizing energy has limited effect on thermal and mechanical properties of substratesSeparate UV primer layer may be used for grafting/enhanced adhesionMaterials that soak into porous substrates (uncoated paper) may limit curing
EBMay cross-link or degrade polymer substratesLow-voltage allows surface curing with little or no effect on inside surfaceEffect may be beneficial
Cross-linking film for shrink applicationsSimultaneous curing and grafting for enhanced adhesionSimultaneous curing on surface and sterilization of food contact layer
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Heat ControlUV
Mercury lamps produce significant heatHeat control measures needed for many packaging films
Dichroic reflectorsHot mirrorsWater cooled lampsChill drums
EBCooler process compared to UVMany packaging films can be run without special coolingEB units available with or without integral chill drums
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Food Packaging Considerations
UVProperly formulated systems produce little or no taint or odorNeed to consider migration of residual uncured materialMethodology available to establish food law complianceNeed to consider photoinitiator migration
Unreacted photoinitiator as well as fragmentsNew systems available to minimize migration
Polymeric photointiatorsReactive photointiatorsResins with built-in initiators
New systems performance limited for dark inks
EBProperly formulated systems produce little or no taint or odorHigh conversions may be achievedNeed to confirm that migration does not occurMethodology available to establish food law compliancePhotoinitiator is not used
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Consistency/MaintenanceUV (mercury arc lamps)
Output can decrease as lamps ageDecrease not uniform across spectral outputDecrease may not be uniform across the webSystems available that can monitor and adjust outputTypical preventative maintenance interval 1000 to 3000 hoursMaintenance interval will depend on process cleanliness and lamp temperature controlTypical maintenance items are bulbs and reflectorsMultiple lamp systems allow process to continue at slower speed incase of single lamp failure
EBOutput is very consistent over time (on or off)Cross-web uniformity is constant over timeTypical preventative maintenance interval is 4000 to 8000 hoursMaintenance interval will depend on process cleanliness and window/foil temperature controlTypical preventative maintenance items are window foil and filamentsProcess must be stopped for window foil or filament change
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Measurement
UVMeasurement is critical for maintaining a constant processWide range of radiometers are available
Probes (inserted, fixed)Radiometer attached to substratesUV sensitive films attached to substrates
Need to understand limits of each type of radiometer
EBMeasurement is critical for maintaining a constant processEB sensitive film dosimeters most commonDosimeters traceable to NIST standards
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UV/EB Package Printing(by printing technology)
Printing Technology UV EB
Gravure Limited Limited
Flexo - narrow web Well established Limited
Flexo – wide web Limited Limited/Growing
Offset - web Established Established/Growing
Offset - sheet fed Well established Limited
Screen Well established Not used
Digital Growing (ink jet) Not used
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In-line Flexo with Interstation UV Curing
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Wide Web EB Flexo Printing (WetFlexTM)
ELECTRON BEAM
FLEXOCI DRUM
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EB Curing In-Line with Web Offset Printing
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UV/EB Package Printing(by package type)
Package Type UV EB
Folding cartons Well established Well established
Multi-wall bags Well established Well established
Flexible packaging Limited Limited/Growing
Ridged containers-Labels-Cans-Plastic/composite/lids
Well establishedWell establishedWell established
Established/GrowingNot usedLimited
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Conclusions
UV and EB are environmentally sound technologies well suited for use in printing and packaging applicationsThe selection of UV or EB should be based on the best fit for the selected application
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Thank you
PRESENTED BY
Steve LapinApplications SpecialistPCT Engineered [email protected]